Pic emulator

here last release 1.4 with cc5x. Fixed pause & stop reply in cmd_list table. Not all HU cmd are decoded in this release due to compiler 1K limit.

I moved to boostC compiler. The final release for this one is 1.7 - Now all work fine.
The volume doesn't change if there isn't a spdif signal connected.
I have done my last test with a portable dvd player that has a spdif out.
If you use the PIC internal osc, pay attention to calibrate it with the OSCTUNE register becouse HU can't decode command with wrong baude rate. In the last version i calibrate the baude rate with an oscilloscope for 104uS x bit and choose osctune =6.
The next step is to control through the pic port, some cmos switch to interface the dvd button play,pause,next,prev.
Anybody there have a functioning prototype?
Bye
Ale

Now, looking at the pinout chart at the bottom, it seems the input for this model is analog (judging from the left and right inputs, digital would be left and right into one pin). Am I correct?

Well, indeed, it looks like it. The rule of thumb for renault is "cars made before 2000 have a analog HU - cars of 2000 and later have a digital HU".

If so, it should be easy to connect any (normal) analog audio signal, providing the radio can be fooled into thinking a CD changer is connected, right?

In theory, yes. Although, the emulators we talk about here are specific to a certain version of the protocol, and we already observed different behaviours even between digital models (Tuner List vs Update List).
I have no idea if the control protocol has changed between your model and more recent ones, and I guess the only way to know will be to test... remembering the disclaimer in post #1 of course...

Ah yes, I remember the URL. My understanding of the Spanish language is next to zero, but I am quite sure that the purpose of the RCA "hack" is to allow for an external power amplifier to be connected, e.g. to drive an extra subwoofer. In other words: the points marked are line outputs, not inputs.

Now, looking at the pinout chart at the bottom, it seems the input for this model is analog (judging from the left and right inputs, digital would be left and right into one pin). Am I correct?

The guy's description of the blue 8-pin mini-ISO does not apply to the 22DC278, but it belongs to earlier HUs which did have analog inputs. The proper pinout of your (and mine) mini-ISO is shown here (pins C13..C20).

Ultimately, i'd like to connect my PocketPC/Phone to the car radio and play MP3's over it, as well as using the radio as "car-kit".

Putput, Thanks for the attachment which shows how to attach an audio device to the AUX input of an Update List radio. (I want to attach the audio output of either my Tomtom 910 or my iPod, bot of which have a standard 3.5mm jack output), but I cannot find anyone who produces such a lead or who can even sell me the (green) mini ISO. Does anyone know where I can get hold of these and, when if I can only get the mini ISO separately, is it easy to connect to a lead? Thanks

Hello busheyguy, look here and search for this article number: 378652. I didn't find a prepared lead, you'll have to make a DIY one but it's no so difficult. Special tools are preferable but not necessary, with a simple pair of pincers and some patience you can fit the wires to the ISO connector. There's an even simpler solution for the jack-part. I bought a prepared 3.5mm jack extension cable, cut off the female connector and applied the ISO connector to this end, easy. BUT BE CAREFULL, the AUX input is very sensitive to high voltages (static electricity)

I know because I blew up the AUX input of my first HU. (And managed to get a new one from my cardealer under warranty)

As opposed to the picture in this thread. This picture shows 3 mini-ISO sockets on top (C-section). Judging from this picture there is a fuse as well (10 A). My HU doesn't have the fuse either.

Here is a page showing precisely the connectors on Tuner List and Update List models.
Note that although these pictures come from digital models, as far as I know there is no visual difference between a blue connector with analog or with digital connections...

That's great. I have placed my order. Many thanks. What is the best way to avoid static electricity?

The most important thing is that you have to make sure that everything is grounded before you connect it, including you. You don't have to stick a wire were the sun doesn't shine but it helps . (Sorry, bad joke) Try to connect your audio device to the ground of your car (- minus) before connecting the input. That should do the trick, and of course do not touch the mini-jack connecter with your hands when the ISO connector is plugged into the HU.